The traditional backpack with a difference—it's waterproof.

这个跟传统背包不同—它防水。

《牛津词典》

I'd definitely recommend a strong pair of boots, waterproof would be best; it's quite muddy at the moment, and your own gloves would also be advisable.

我当然推荐一双结实的靴子，最好是防水的；现在路上很泥泞，你最好也戴上自己的手套。

youdao

The underseal is a kind of waterproof material to coat the bottom of the car.

底封是一种涂在汽车底部的防水材料。

youdao

Before a storm, sailors cover the hatches with waterproof material.

VOA: special.2009.05.24

After a flood, food safety specialists at the United States Department of Agriculture have this advice: Throw away anything that is not stored in a waterproof container if there was a chance of contact.

VOA: special.2010.07.19

The ministers used waterproof markers to sign the document, printed on a white board.

VOA: standard.2009.10.17

The paddles had the same type of LCD lights as a regular TV and were waterproof, a requirement for London's soggy Olympic Games.

WSJ: Menu

Being waterproof with a built-in battery allows explorers of all kinds to focus their attention on what's most important: the adventure.

ENGADGET: ContourRoam waterproof camera takes hands-free filmmaking underwater

All of that is waterproof to a pretty decent 43ft, too, so it should stay safe under the most extreme conditions.

ENGADGET